322 



CRETACEOUS LAMELLIBRANCHIA. 



reaching their maximum height not far from the umbo. The variety Cuvieri 

 ranges from the zone of Terebratulina lata to the zone of Micraster cor-anguinum. 



T. Mantelli, de Mercey, 1 from the zone of Micraster cor-anguinum, appears to 

 be a large form of I. LamarclcL var. Gtivieri, in which an anterior ear is developed ; 

 it is similar to a specimen (Fig. 74) obtained by Dr. Blacktnore from the zone of 

 Micraster cor-anguinum of Camp TT ill near Salisbury. 



i t 



Fig SI. — Inoceramu* Lamarcki var. Cuvieri, Sow. Zone of Terthratulinu lata, Blue Bell Hill, Burhara. 

 Mr. Dibley's Collection. Left valve with posterior part missing ; anterior view of the same valve, x I. 



I. percoxtatus, Miiller 2 (especially the example figured by Petrasckeck 3 ), seems 

 to be closely allied to I. Lamarcki var. Websteri. 



Types. — /. Lamarclci, Parkinson (Fig. (13), from near Dover (probably /one of 



1 ' Mem. Soc. Linn. Nord de la France,' vol. iv (1877), p. 324. pis. i, li. Barrois, 'Ann. Soc. 

 geol. Nord,' vol. vi (1879), p. 454, pi. iv. 



- ' Jahrb. d. k. preuss. geol. Landesanst. u. Bergakad. f ur 1887' (1888), p. 413, pi. xvii, tig. 3. 



3 ' Jalirb. d. k. k. geo'. Reich sanst.,' vol. hi (1906), p. 163, fig. 2. Also I. Glatzise and I. Kleini, 

 Andert, ' Tnoceramen d. Kreibitz-Zittauer Sand stein geb.' (1911), pp. 48, 52, pi. i, fig. 3, pi. ii, fig. 8. 



